installing some dependencies from requirements.txt in a conda environment fails

[Maosef]

For reference, I ran pip install -r requirements.txt in a conda environment. The following appears when trying to install numba.

running build_ext
building 'numba._dynfunc' extension
C compiler: gcc -pthread -B /home/amao1/anaconda3/envs/sort/compiler_compat -Wl,--sysroot=/ -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC

creating build/temp.linux-x86_64-3.7
creating build/temp.linux-x86_64-3.7/numba
compile options: '-I/home/amao1/anaconda3/envs/sort/include/python3.7m -c'
gcc: numba/_dynfuncmod.c
In file included from numba/_dynfuncmod.c:1:0:
numba/_dynfunc.c: In function ‘dup_string’:
numba/_dynfunc.c:238:9: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
tmp = PyString_AsString(strobj);
^
numba/_dynfunc.c: In function ‘generator_dealloc’:
numba/_dynfunc.c:350:10: error: ‘_Py_Finalizing’ undeclared (first use in this function); did you mean ‘_Py_IsFinalizing’?
if (!_Py_Finalizing)
^~~~~~~~~~~~~~
_Py_IsFinalizing
numba/_dynfunc.c:350:10: note: each undeclared identifier is reported only once for each function it appears in
In file included from numba/_dynfuncmod.c:1:0:
numba/_dynfunc.c: In function ‘dup_string’:
numba/_dynfunc.c:238:9: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
tmp = PyString_AsString(strobj);
^
numba/_dynfunc.c: In function ‘generator_dealloc’:
numba/_dynfunc.c:350:10: error: ‘_Py_Finalizing’ undeclared (first use in this function); did you mean ‘_Py_IsFinalizing’?
if (!_Py_Finalizing)
^~~~~~~~~~~~~~
_Py_IsFinalizing
numba/_dynfunc.c:350:10: note: each undeclared identifier is reported only once for each function it appears in
error: Command "gcc -pthread -B /home/amao1/anaconda3/envs/sort/compiler_compat -Wl,--sysroot=/ -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/home/amao1/anaconda3/envs/sort/include/python3.7m -c numba/_dynfuncmod.c -o build/temp.linux-x86_64-3.7/numba/_dynfuncmod.o" failed with exit status 1

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Failed building wheel for numba

[pmixer]

So try conda install numba?